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    <title>Document</title>
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       <!-- id class tagname的应用 -->
    <div id="sum">
        <ol id="Coursre">
            <li id="Scheme" class="lang">Scheme</li>
            <li id="JavaScript" class="lang">JavaScript</li>
            <li id="Python" class="lang">Python</li>
            <li id="Ruby" class="lang">Ruby</li>
            <li id="Haskell" class="lang">Haskell</li>
        </ol>
        <ol id=  "sh">
            <li id="" class="lang">牙膏</li>
            <li id="" class="lang">牙刷</li>
            <li id="" class="lang">毛巾</li>
            <li id="" class="lang">毛毯</li>
            <li id="" class="lang">被子</li>
        </ol>
        <ol id="pet">
            <li id="" class="lang">猫</li>
            <li id="" class="lang">狗</li>
            <li id="" class="lang">鸟</li>
            <li id="" class="lang">鱼</li>
            <li id="" class="lang">猪</li>
        </ol>

    </div>

    <!-- name的应用 -->
    <!-- <div id="name">
        <p>（button）按钮</p>
        <input type="button">
        <p>（checkbox）复选框</p>
        <input type="checkbox">篮球 &nbsp;<input type="checkbox">羽毛球 &nbsp;<input type="checkbox">跑步 
        <p>（color）颜色吗？</p>
        <input type="color">
        <p>（date）日期表</p>
        <input type="date">
        <p>（datetime）时刻表</p>
        <input type="datetime">
        <p>（email）邮箱输入框</p>
        <input type="email" >
        <p>（file）文件上传器</p>
        <input type="file">
        <p>？？？？是个啥</p>
        <input type="hidden"> 
        <p>（image）图片</p>
        <input type="image" src="./img/204.jpg">
        <input type="number">
        <p>（number）加减数值</p>
        <input type="number">
        <p>（text）文本框</p>
        <input type="text" height="100px" width="20px">
        <p>（submit）提交</p>
        <input type="submit">

    </div>
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